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4 Fashion Staples Every Woman Should Own by the Time She's 30

There's a lot of buildup to turning 30—just ask Olivia Wilde. As I approach the big 3-0 myself, I think it's important to be prepared from a fashion perspective in addition to the oft-discussed career-love-life perspective. You're likely no longer angling for your first job, managing your first big relationship, or moving into your first pad solo—so your wardrobe shouldn't be a starter one either. If you haven't already, invest in these four fashion staples that will keep you polished and ready for anything: from a big meeting at work to dinner with the in-laws. These special pieces will work overtime and then some in your wardrobe rotation—and with proper care they should last a very, very (very) long time.

1.) The Perfect Black Pump: Aim for a walkable high-heel style with a pointy toe or almond-shaped toe. This silhouette has withstood the test of time because it streamlines any outfit and remains the go-to for day or night, work or date. Let these classics from Manolo Blahnik inspire you.

2.) A Structured Handbag: A structured East-West (a rectangular bag, like the Chanel one pictured) can fit all your must-haves but will keep you looking put-together.

3.) An Oversize Watch: I like a menswear-inspired style like this one from Michael Kors, because it can be worn at the office or on the weekend with a T-shirt and jeans.

4.) One Gorgeous Piece of Jewelry: Whether it's fine jewelry or costume, seek a piece that will transform an outfit and become a conversation starter. Just make sure it's indicative of your personal style and unique. It will become your go-to dress-up piece! Here are some ideas from Amedeo and Oscar de la Renta, respectively.